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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
The shoulder complex comprises 30 muscles. These muscles both move the shoulder and stabilise it - 'movers' and 'shakers'. The rotator cuff muscles predominantly stabilise the glenohumeral joint, but also contribute significantly to movement. The rotator cuff muscles are: Supraspinatus.